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© Judith Herzfeld 1997,1999 These exercises are provided here for classroom and study use only. All other uses are copyright protected. © Judith Herzfeld 1997, 1999 4.3-110 For a particle in a 2D rectangular box, the number of lobes of electron density in the nx=2, ny=5 state is (a) (c) 2 5 (b) (d) 3 10 The number of nodal lines is (a) (c) © Judith Herzfeld 1997, 1999 1 4 (b) (d) 2 5 4.3-210 The electron density of a given state of a 2D H-atom is given by the contour map This state has (a) 1 angular node only (b) 1 radial node only (c) 1 angular node and 1 radial node (d) 2 angular nodes The quantum numbers for this state are (b) n = 2, l = 1 (a) n = 2, l = 0 (c) n = 3, l = 1 (d) n = 3, l = 2 © Judith Herzfeld 1997, 1999 4.3-310 The number of angular nodes in a 3s atomic orbital is (a) 0 (c) 2 (b) 1 (d) 3 The number of radial nodes in a 3s atomic orbital is (a) 0 (c) 2 © Judith Herzfeld 1997, 1999 (b) 1 (d) 3 4.3-320 An atomic orbital has 2 angular nodes and 1 radial node. It is a (a) 2p (c) 3d orbital. © Judith Herzfeld 1997, 1999 (b) 3p (d) 4d 4.3-330 Among the designations n = 3, l = 2, ml = -2 II. n = 3, l = 1, ml = 0 III. n = 3, l = 0, ml = -1 IV. n = 3, l = 2, ml = 0 V. n = 3, l = 3, ml = -2 I. which does not describe an allowed state for an electron in an atom? (a) II and IV (c) III and V © Judith Herzfeld 1997, 1999 (b) I and III (d) IV and V 4.3-340 Which of the following is not an atomic orbital? (a) 2p (c) 3f © Judith Herzfeld 1997, 1999 (b) 5s (d) 4d 4.3-350 What is the full degeneracy of the n=3 state of a H-atom (in the absence of a magnetic field)? (a) 4 (c) 8 © Judith Herzfeld 1997, 1999 (b) 10 (d) 18 4.3-411 (1s)2(2s)2(2px)2 represents a configuration of a (a) beryllium (b) boron (c) carbon (d) nitrogen atom. © Judith Herzfeld 1997, 1999 4.3-412 The (1s)2(2s)2(2px)2 state of a carbon atom is (a) the ground state (b) an excited state © Judith Herzfeld 1997, 1999 4.3-420 Which of the following represents the ground state of a nitrogen atom? (a) (1s)2(2s)2(2px) (b) (1s)2(2s)2(2px)3 (c) (1s)2(2s)2(2px)2(2py) (d) (1s)2(2s)2(2px)(2py)(2pz) Which represents an excited state of a nitrogen atom? Which is not a state of any atom at all? © Judith Herzfeld 1997, 1999 4.3-425 Which of the following is not an excited state of a silicon atom? (a) (Ne)(3s)(3px)(3py)(3pz) (b) (Ne)(3s)2(3px)2 (c) (Ne) (3s)2(3px)(3py) (d) (Ne)(3px)2(3py)(3pz) © Judith Herzfeld 1997, 1999 4.3-430 The electronic configuration of element X is (1s)2(2s)2(2p)6(3s)2(3p)3. The formula of the most probable compound that X will form with Ca is (b) Ca3X2 (a) CaX2 (c) Ca2X © Judith Herzfeld 1997, 1999 (d) Ca2X3 4.3-440 The ground state electronic configuration of Fe3+ is (a) (Ar)183d34s2 (b) (Ar)183d64s2 (c) (Ar)183d5 (d) (Ar)183d44s © Judith Herzfeld 1997, 1999 4.3-450 Which of the following sets of quantum numbers, n, l, ml and ms, describes one of the outermost electrons in a ground state strontium atom? (a) 5,1,1,+1/2 (b) 5,0,1,+1/2 (c) 5,0,0,-1/2 (d) 5,2,1,-1/2 © Judith Herzfeld 1997, 1999 4.3-460 Which of the following ions is paramagnetic? (a) Ag+ (b) Zn2+ (c) Ni2+ (d) Sc3+ © Judith Herzfeld 1997, 1999 4.3-470 Which of the following atoms has the largest number of unpaired electrons in its ground state? (a) Sn (b) Ag (c) Rh (d) Mo © Judith Herzfeld 1997, 1999 4.3-480 Suppose that the electron spin quantum number could have three possible values. Which of the following atomic numbers would not correspond to a noble gas? (a) 3 (b) 15 (c) 27 (d) 42 © Judith Herzfeld 1997, 1999 4.3-510 Of the following, the atom with the largest first ionization energy is the one with the ground state electronic configuration (a) (Ne) 3s23p1 (b) (Ne) 3s23p2 (c) (Ne) 3s23p3 (d) (Ne) 3s23p4 © Judith Herzfeld 1997, 1999 4.3-520 Of the following, the atom with the smallest first ionization energy is the one with the ground state electronic configuration (a) (Ne) 3s2 (b) (Ne) 3s23p 1 (c) (Ne) 3s23p2 (d) (Ne) 3s23p3 © Judith Herzfeld 1997, 1999 4.3-530 Of the following, the atom with the smallest first ionization energy is the one with the ground state electronic configuration (a) 1s2 2s22p3 (b) (Ne) 3s23p 3 (c) (Ar) 3d104s24p3 © Judith Herzfeld 1997, 1999